- R∝LA.
- R=ρLA.
- A=πr2.
- R=ρLπr2.
- R∝1r2.
What is the relation of resistance and radius?
However, the cross-sectional area of the wire is proportional to the square of the radius of the wire. This means that the resistance of the wire
and radius of the wire is inversely proportional to each other
. Therefore, as the radius increases, the resistance of wire decreases.
What is the formula for resistance?
Resistance has units of ohms (Ω), related to volts and amperes by
1 Ω = 1 V/A
. There is a voltage or IR drop across a resistor, caused by the current flowing through it, given by V = IR.
Does resistance increase with radius?
Vessel resistance (R) is directly proportional to the length (L) of the vessel and the viscosity (η) of the blood, and inversely proportional to the radius to the fourth power (r
4
). … In contrast,
an increase in radius will reduce resistance
.
What is an example of resistance?
The act or an instance of resisting or the capacity to resist. Resistance is defined as a refusal to give in or to something that slows down or prevents something. An example of resistance is
a child fighting against her kidnapper
. An example of resistance is wind against the wings of a plane.
How do you solve for resistance?
Rearrange V = IR to solve for resistance:
R = V / I (resistance = voltage / current)
. Plug the values you found into this formula to solve for total resistance. For example, a series circuit
What happens to resistance if radius is doubled?
Thus, if radius is doubled,
area increases four times
and hence the resistance becomes one-fourth.
Does resistance increase with diameter?
Resistance is inversely proportional to cross sectional area
. So if the diameter is halved the cross-sectional area is quartered and the resistance is quadrupled.
How do you find resistance with length and radius?
The resistance R of a cylinder of length L and cross-sectional area A is
R=ρLA R = ρ L A
, where ρ is the resistivity of the material.
What is a good sentence for resistance?
Noun
They have shown a stubborn resistance to change
. The troops met heavy resistance as they approached the city. The paint shows good weather resistance. Over time the patient could develop a resistance to the drug.
What are examples of resistance training?
- Free weights – classic strength training tools such as dumbbells, barbells and kettlebells.
- Medicine balls or sand bags – weighted balls or bags.
- Weight machines – devices that have adjustable seats with handles attached either to weights or hydraulics.
What causes resistance?
An electric current flows when electrons move
through a conductor, such as a metal wire. The moving electrons can collide with the ions in the metal. This makes it more difficult for the current to flow, and causes resistance.
How do you find the maximum resistance?
Take the nominal value and multiply it by 1 + your tolerance, which is (1+0.1). Then take the nominal value and multiply it by 1 – tolerance, or (1-0.1). The highest possible value is
517 K
. The lowest possible value is 423 K.
How do you solve for parallel resistance?
The sum of the currents through each path is equal to the total current that flows from the source. You can find total resistance in a Parallel circuit with the following formula:
1/Rt = 1/R1 + 1/R2 + 1/R3 +
… If one of the parallel paths is broken, current will continue to flow in all the other paths.
How do you find resistance in parallel?
The sum of the currents through each path is equal to the total current that flows from the source. You can find total resistance in a Parallel circuit with the following formula:
1/Rt = 1/R1 + 1/R2 + 1/R3 +.
.. If one of the parallel paths is broken, current will continue to flow in all the other paths.
What is the resistance when both the length and radius of the wire are doubled?
According to the question, the radius of the wire is doubled. Thus, the answer is (B). Note: We found the answer to be
one-fourth
as per this particular situation. But if the situation was to double the length, then the new resistance becomes four times of the original resistance.
